JP2020022219A - Motor drive control device, motor, and blowing device - Google Patents

Abstract

To provide a motor drive control device capable of enhancing a start success rate of a motor part, and to provide a motor and a blowing device.SOLUTION: A motor drive control device comprises a drive control unit for controlling driving of a motor part to which a three-phase AC voltage is input to switch current application patterns of phase winding of the motor part in a predetermined order, a voltage detection unit for detecting voltage of the phase winding, and a position information generation part for generating rotational direction position information of a rotor of the motor part on the basis of a detection result of the voltage detection unit. The drive control unit starts a synchronous operation by which a current application pattern is switched according to the rotational direction position information when being able to detect a rotational direction position of the rotor as any rotational direction position among a first rotational direction position to a sixth rotational direction position that are divided thereinto at each electrical angle of 60°, by the rotational direction position information after predetermined current application. On the other hand, the drive control unit adds current application in the current application pattern thereinto, when being undetectable as any rotational direction position as described above.SELECTED DRAWING: Figure 4

Description

  The present disclosure relates to a motor drive control device, a motor, and a blower.

  2. Description of the Related Art A blower equipped with a sensorless control type brushless DC motor has been known. In a brushless DC motor of a sensorless control system, a rotational position of a rotor is detected based on an induced voltage generated in the rotor. However, at the time of startup, the rotor stops or rotates at a low speed, so that the rotational position of the rotor cannot be detected. Therefore, for example, in Japanese Patent Application Laid-Open No. 2010-045941, after the rotor is raised to a certain number of rotations by forced commutation, the rotational direction position of the rotor is detected in a state in which forced commutation is stopped and coasting is performed, Shift to sensorless control.

JP 2010-045941 A

  The starting by the forced commutation rotates the rotor by the rotating magnetic field from the stator regardless of the position of the rotor in the rotation direction. Therefore, it may be difficult for the rotor to rotate smoothly. In addition, at the start of startup, since the level of the induced voltage generated by the rotor is low, it is difficult to detect the position of the rotor in the rotation direction. Therefore, the transition from the forced commutation at the time of startup to the sensorless control may fail. In order to restart the brushless DC motor when the transition to sensorless control fails, initial processing such as short brake is performed, and forced commutation is performed after stopping the rotor. Take it. Further, if the forced commutation is repeated only after the initial process, the failure to shift to the sensorless control may be repeated.

  An object of the present disclosure is to provide a motor drive control device, a motor, and a blower that can increase the success rate of starting a motor unit.

  An example motor drive control device of the present disclosure controls a drive of a motor unit to which a three-phase AC voltage is input, and a drive control unit that switches an energization pattern to a phase winding of the motor unit in a predetermined order. A voltage detection unit that detects a voltage of the phase winding; and a position information generation unit that generates rotation direction position information in a rotation direction of a rotor of the motor unit based on a detection result of the voltage detection unit. The drive control unit determines the rotational direction position of the rotor from the first rotational direction position to the sixth rotational direction position, which is divided into electrical angles of 60 °, based on the rotational direction position information after the predetermined energization. If it can be detected as any one of the rotational direction positions, the synchronous operation for switching the energization pattern according to the rotational direction position information is started. The drive control unit adds energization in the energization pattern when the rotational direction position of the rotor cannot be detected as any of the rotational direction positions based on the rotational direction position information after predetermined energization.

  An exemplary motor according to an embodiment of the present disclosure includes a motor unit to which a three-phase AC voltage is input, and the above-described motor drive control device that controls driving of the motor unit.

  An exemplary blower of the present disclosure includes an impeller having blades rotatable about a central axis extending in a vertical direction, and the above-described motor that rotates the blades.

  According to the exemplary motor drive control device, the motor, and the blower of the present disclosure, the activation success rate of the motor unit can be increased.

FIG. 1 is a block diagram illustrating an example of the blower. FIG. 2 is a graph showing terminal voltages detected according to the electrical angle of the rotor in the sensorless control of the motor unit. FIG. 3 is a flowchart illustrating an example of drive control of the motor unit. FIG. 4 is a flowchart illustrating an example of a start-up operation of the motor unit.

  Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the drawings.

  In the present specification, a direction parallel to the rotation center axis CA of the motor unit 1 and the blades 111 in the blower 100 is referred to as an “axial direction”.

  Each of the U-phase winding 12u, the V-phase winding 12v, and the W-phase winding 12w of the stator 11 of the motor unit 1, or a generic name of these, may be referred to as a phase winding 12. In the three-phase AC voltage, a phase that is energized to the phase winding 12 is called an energized phase, and a phase that is not energized to the phase winding 12 is called a non-energized phase. A combination of two energized phase windings 12 is called an energization pattern. Further, each of the U-phase voltage, the V-phase voltage, and the W-phase voltage of the three-phase AC voltage, or a collective term thereof, may be referred to as a phase voltage.

<1. Embodiment>
<1-1. Configuration of blower>
FIG. 1 is a block diagram illustrating an example of the blower 100. In the present embodiment, the blower 100 is an axial fan that generates an airflow that flows from one axial direction to the other. However, the present invention is not limited to this example, and the blower 100 may be a centrifugal fan that sends air taken in from the axial direction to the outside in the radial direction.

  As shown in FIG. 1, the blower 100 includes an impeller 110 and a motor 120. The impeller 110 has blades 111 rotatable about a central axis CA extending in the vertical direction. The motor 120 drives and rotates the impeller 110 to rotate the blade 111. A DC power supply 200 is connected to the blower 100. DC power supply 200 is a power source of blower 100. As shown in FIG. 1, a positive output terminal on the high voltage side of the DC power supply 200 is connected to an inverter 3 described later of the motor 120. The negative output terminal on the low voltage side of DC power supply 200 is grounded.

<1-2. Components of Motor>
Next, each component of the motor 120 will be described. The motor 120 includes a motor unit 1, an inverter 3, and a motor drive control device 4.

  As described above, the motor 120 includes the motor unit 1. A three-phase AC voltage is input from the inverter 3 to the motor unit 1. The motor unit 1 is, for example, a three-phase brushless DC motor (BLDC motor). More specifically, the motor unit 1 includes a rotor 10 and a stator 11. The rotor 10 is provided with a permanent magnet. The stator 11 is provided with a U-phase winding 12u, a V-phase winding 12v, and a W-phase winding 12w. In the present embodiment, one ends of the phase windings 12u, 12v, 12w are connected to terminals 13u, 13v, 13w of the motor unit 1, respectively. The other ends of the phase windings 12u, 12v, and 12w may be Y-connections connected around the neutral point 12c as in the present embodiment, or may be Δ-connections.

  Further, as described above, the motor 120 includes the inverter 3. Inverter 3 outputs a three-phase AC voltage to motor unit 1. The inverter 3 has upper arm switches 31u, 31v, 31w and lower arm switches 32u, 32v, 32w. The upper arm switches 31u, 31v, 31w and the lower arm switches 32u, 32v, 32w form a bridge circuit that generates a three-phase AC voltage to be output to the motor unit 1. The bridge circuit includes a U-phase arm in which a high voltage side upper arm switch 31u and a low voltage side lower arm switch 32u are connected in series, a high voltage side upper arm switch 31v and a low voltage side lower arm switch. It has a V-phase arm to which 32v is connected in series, and a W-phase arm to which a high-voltage-side upper arm switch 31w and a low-voltage-side lower arm switch 32w are connected in series. These arms are connected in parallel with each other. The high voltage side end of each arm is connected to the high voltage side terminal of DC power supply 200. Therefore, a DC voltage from the DC power supply 200 is applied to each arm. The low voltage side end of each arm is grounded via a current detecting resistor 3a.

  The upper arm switches 31u, 31v, 31w and the lower arm switches 32u, 32v, 32w each include a switching element and a diode. As the switching element, for example, an FET (field effect transistor), an IGBT (insulated gate bipolar transistor), or the like is used. The diode is connected in parallel with the switching element, with the direction from the low voltage side to the high voltage side of DC power supply 200 being the forward direction. In other words, the anode of the diode is connected to the low voltage side end of the switching element, and the cathode is connected to the high voltage side end of the switching element. The diode functions as a free wheel diode (freewheel diode). Further, the diode may be a parasitic diode (that is, a body diode built in the FET) or may be externally connected to the switching element.

  Next, as described above, the motor 120 includes the motor drive control device 4. The motor drive control device 4 controls the drive of the motor unit 1. More specifically, the motor drive control device 4 performs PWM control of the inverter 3 and controls driving of the motor unit 1 via the inverter 3.

<1-3. Components of Motor Drive Controller>
As shown in FIG. 1, the motor drive control device 4 includes a drive control unit 41, a current detection unit 42, a storage unit 43, a voltage detection unit 44, a position information generation unit 46, a rotation speed detection unit 47, , Is provided.

  As described above, the motor drive control device 4 includes the drive control unit 41. The drive control unit 41 controls the drive of the motor unit 1 to which the three-phase AC voltage is input, and switches the energization pattern to the phase winding 12 of the motor unit 1 in a predetermined order n. Note that n is a positive integer. For example, the drive control unit 41 performs sensorless control of the drive of the motor unit 1 using a program and information stored in the storage unit 43. The drive control unit 41 controls the on / off of the upper arm switches 31u, 31v, 31w or the lower arm switches 32u, 32v, 32w of the inverter 3 by PWM pulses, thereby outputting a three-phase AC voltage to the motor unit 1. Is used to control the driving of the motor unit 1.

  As described above, the motor drive control device 4 includes the current detection unit 42. The current detection unit 42 detects a current value flowing through the motor unit 1. In the present embodiment, the current detection unit 42 detects a current flowing through the current detection resistor 3a connected between the bridge circuit of the inverter 3 and the ground terminal.

  The storage unit 43 is a non-transitory storage medium that maintains storage even when power supply is stopped. The storage unit 43 stores information used in each component of the motor drive control device 4, and particularly stores programs and control information used in the drive control unit 41.

  As described above, the motor drive control device 4 includes the voltage detection unit 44. The voltage detector 44 detects the voltage of the phase winding 12. In the present embodiment, for example, the voltage detection unit 44 detects the terminal voltage of the terminal 13 connected to the phase winding 12 that is not energized as the voltage of the phase winding 12 among the terminal voltages Vu, Vv, and Vw. I do. More specifically, the voltage detection unit 44 detects the terminal voltage Vu of the terminal 13u when the current is applied between the terminals 13v and 13w of the motor unit 1 as the U-phase voltage of the U-phase winding 12u. Further, the voltage detection unit 44 detects the terminal voltage Vv of the terminal 13v when the electric current is applied between the terminals 13w and 13u of the motor unit 1 as the V-phase voltage of the V-phase winding 12v. The terminal voltage Vw of the terminal 13w when current is supplied between 13v is detected as the W-phase voltage of the W-phase winding 12w.

  As described above, the motor drive control device 4 includes the position information generation unit 46. The position information generation unit 46 generates rotation direction position information in the rotation direction of the rotor 10 of the motor unit 1 based on the detection result of the voltage detection unit 44. FIG. 2 is a graph showing terminal voltages Vu, Vv, and Vw detected according to the electrical angle of the rotor 10 in the sensorless control of the motor unit 1. In FIG. 2, the curve portions of the terminal voltages Vu, Vv, and Vw indicate the voltages when no current is applied. The rotation direction position information indicates the rotation direction position of the rotor 10 by any one of the first rotation position to the sixth rotation direction position that is divided into electrical angles of 60 °.

  For example, when the phase winding 12 is excited as shown in FIG. 2, if the non-energized phase is the U phase, the U-phase terminal voltage Vu changes from a level lower than the virtual neutral point voltage Vn to a higher level. In this case, the rotation direction position information indicates that the rotor 10 is in the first rotation direction position at an electrical angle of 0 °. When the U-phase terminal voltage Vu changes from a level higher than the virtual neutral point voltage Vn to a lower level, the rotation direction position information indicates that the rotor 10 is in the fourth rotation direction position at an electrical angle of 180 °. Indicates that In other words, at a point where the terminal voltage Vu increases and becomes equal to the virtual neutral point voltage Vn, the rotor 10 is detected as being in the first rotation direction position where the electrical angle is 0 °. Further, at a point where the terminal voltage Vu decreases and becomes equal to the virtual neutral point voltage Vn, it is detected that the rotor 10 is at the fourth rotation direction position where the electrical angle is 180 °.

  If the non-energized phase is the V phase, and if the V-phase terminal voltage Vv changes from a level lower than the virtual neutral point voltage Vn to a higher level, the rotation direction position information indicates that the rotor 10 has an electrical angle of 120 °. In the third rotation direction. When the V-phase terminal voltage Vv changes from a higher level to a lower level than the virtual neutral point voltage Vn, the rotation direction position information indicates that the rotor 10 is at the sixth rotation direction position where the electrical angle is 300 °. Indicates that In other words, at the point where the terminal voltage Vv rises and becomes equal to the virtual neutral point voltage Vn, it is detected that the rotor 10 is at the third rotation direction position where the electrical angle is 120 °. Further, at a point where the terminal voltage Vv decreases and becomes equal to the virtual neutral point voltage Vn, it is detected that the rotor 10 is at the sixth rotation direction position where the electrical angle is 300 °.

  If the non-energized phase is the W phase, and if the W-phase terminal voltage Vw changes from a level higher than the virtual neutral point voltage Vn to a lower level, the rotation direction position information indicates that the rotor 10 has an electrical angle of 60 °. In the second rotation direction. When the W-phase terminal voltage Vw changes from a level lower than the virtual neutral point voltage Vn to a higher level, the rotation direction position information indicates that the rotor 10 is at the fifth rotation direction position where the electrical angle is 240 ° in electrical angle. Indicates that In other words, at the point where the terminal voltage Vw decreases and becomes equal to the virtual neutral point voltage Vn, it is detected that the rotor 10 is at the second rotational direction position where the electrical angle is 60 °. At the point where the terminal voltage Vw rises and becomes equal to the virtual neutral point voltage Vn, it is detected that the rotor 10 is at the fifth rotational direction position where the electrical angle is 240 °.

  For example, when the rotor 10 decelerates, stops, or reversely rotates without rotating smoothly, the respective terminal voltages Vu, Vv, Vw may not be equal to the virtual neutral point voltage Vn. is there. In such a case, since the rotational direction position of the rotor 10 is unknown, the position information generating unit 46 creates, for example, rotational direction position information indicating that the rotational direction position is unknown.

  As described above, the motor drive control device 4 includes the rotation speed detection unit 47. The rotation number detection unit 47 detects the rotation number of the rotor 10 of the motor unit 1 based on the rotation direction position information.

<1-4. Example of drive control of motor section>
Next, an example of drive control processing of the motor unit 1 by the motor drive control device 4 will be described. FIG. 3 is a flowchart for explaining an example of drive control of the motor unit 1.

  At the start of FIG. 3, the rotor 10 of the motor unit 1 is stopped or rotating at a low speed. Therefore, in order to generate an induced voltage necessary for generating the rotational direction position information in each of the phase windings 12u, 12v, and 12w, the drive control unit 41 performs a start-up operation of the motor unit 1 (Step S1). In the start-up operation, after an initial process such as a short brake is performed, the rotor 10 of the motor unit 1 is forcibly driven to rotate by forced commutation. In the forced commutation, specific two of the three phase windings 12 of the motor unit 1 are energized and excited every predetermined energization period. The combination of the two phase windings 12 is switched in a predetermined order n.

  When the rotor 10 rotates smoothly in the start-up operation, the drive control unit 41 performs a synchronous operation of the motor unit 1 in order to accelerate the rotation of the rotor 10 (Step S2). In the synchronous operation, the position information generation unit 46 detects in each energization pattern, for example, the timing at which the phase voltage of the non-energized phase becomes the same as the virtual neutral point voltage Vn and the tendency of the induced voltage to increase or decrease at that timing. The rotation direction position information is created based on the result (see FIG. 2).

  In the synchronous operation, the drive control unit 41 accelerates the rotation of the rotor 10 by switching the energization pattern in accordance with the rotation direction position information for each energization period corresponding to the rotation speed of the rotor 10.

  When the rotation speed becomes equal to or more than the predetermined number, the drive control unit 41 performs a steady control operation of the motor unit 1 (step S3). In the steady control operation, the rotor 10 is rotated at a desired number of revolutions, and the energization pattern is switched according to the drive information of the motor unit 1 and the rotational direction position information. Then, when the driving of the motor unit 1 is stopped (YES in step S4), the driving control process of FIG. 3 ends.

<1-4-1. Start-up operation example of motor section>
Next, an example of the start-up operation of the motor unit 1 will be specifically described. FIG. 4 is a flowchart illustrating an example of a start-up operation of the motor unit 1.

  First, the drive control unit 41 starts a startup operation by forced commutation after an initial process such as a short brake is performed (step S101). In the short brake, the rotor 10 stops due to a short circuit between the terminals 13u, 13v, and 13w of the motor unit 1.

  Next, the drive control section 41 performs energization a total of m times while switching the energization pattern in a predetermined order n (step S102). Note that the first energization frequency m is a positive integer, and is 12 in the present embodiment. The voltage detector 44 detects the phase voltage of the non-energized phase (Step S103). The position information generation unit 46 generates rotation direction position information (Step S104). For example, if the non-energized phase is the U-phase at the time of the m-th energization, the U-phase terminal voltage Vu is detected. If the U-phase terminal voltage Vu tends to increase at a point where the U-phase terminal voltage Vu becomes equal to the virtual neutral point voltage Vn, the rotational direction position information indicating that the rotor 10 is at the first rotational position. Is generated.

  Here, when the drive control unit 41 can detect the rotational direction position of the rotor 10 from the rotational direction position information (YES in step S105), the processing in FIG. 4 ends, and the drive control unit 41 performs the synchronous operation of the motor unit 1. Is started.

  On the other hand, when the drive control unit 41 cannot detect the rotational direction position of the rotor 10 based on the rotational direction position information (NO in step S105), the additional energization process is started. For example, when the rotation direction position information indicates that the rotation direction position of the rotor 10 is unknown, the drive control unit 41 cannot detect the rotation direction position of the rotor 10. Therefore, the drive control unit 41 performs an additional energization process in which the energization pattern is switched at most Sk times to energize the phase winding 12 (forced commutation) so that the rotational position can be detected. The upper limit value Sk is a positive integer of 2 or more, and is set to Sk = 6 in the present embodiment.

  In the additional energization process, first, if the second energization count k energized in the additional energization process has not reached the upper limit value Sk (YES in step S106), the drive control unit 41 switches the energization pattern according to the order n. Power is supplied to the phase winding 12 (step S107). For example, when the energization is performed by switching the energization pattern 12 times before the start of the additional energization process, energization of the phase winding 12 in the first energization pattern is performed. Then, the process returns to S103 to detect the phase voltage of the non-energized phase.

  On the other hand, if the second energization count k that has been energized in the additional energization processing has reached the upper limit value Sk (YES in step S106), the processing in FIG. It returns to S101.

  As described above, in the start-up operation example of FIG. 4, the drive control unit 41 switches the energization pattern in a predetermined order n and energizes the number of energization times to reach the first energization number m, based on the rotation direction position information generated When the rotational position of the rotor 10 can be detected, the synchronous operation is started. In other words, the drive control unit 41 changes the rotational direction position of the rotor 10 from the first rotational direction position to the sixth rotational direction position, which is divided into electrical angles of 60 °, based on the rotational direction position information after the predetermined energization. If it can be detected as any one of the rotational direction positions, the synchronous operation for switching the energization pattern according to the rotational direction position information is started. In addition, when the rotation direction position of the rotor cannot be detected as any of the rotation direction positions based on the rotation direction position information after the predetermined energization, the drive control unit 41 adds the energization in the energization pattern. That is, the drive control unit 41 performs an additional energization process of switching the energization pattern up to Sk times to energize the phase winding 12 (forced commutation).

  In this way, for example, if the rotational direction position of the rotor 10 cannot be detected when the predetermined energization is completed, the drive control unit 41 attempts to start the motor unit 1 by adding energization in an energization pattern. Thus, the success rate of starting the motor unit 1 can be increased. Further, the motor unit 1 can be easily started without restarting which requires initial processing such as a short brake or the like, so that the start success rate of the motor unit 1 can be increased. Further, the starting time of the motor unit 1 can be shortened.

  Here, the predetermined energization is performed by the first energization number m in the energization pattern without using the rotation direction position information. That is, the forced commutation can be performed by the predetermined energization.

  In the start-up operation example in FIG. 4, the first energization frequency m is 12 as described above. That is, the first number of energizations m is the number of energizations until the rotor 10 rotates by an electrical angle of 720 °, assuming that the rotor 10 rotates smoothly. When the energization in the energization pattern is performed until the rotor 10 rotates by an electrical angle of 720 °, in most cases, a result is obtained in which the rotational direction position of the rotor 10 can be detected without adding the energization. . Therefore, the activation of the motor unit 1 becomes easier to succeed. In most cases, the start-up operation of the motor unit 1 is the same every time, so that it is difficult for the user to feel uncomfortable with the start-up operation of the motor unit 1.

  Further, when the rotational direction position of the rotor 10 can be detected in the additional energization processing, the drive control unit 41 immediately starts the synchronous operation based on the rotational direction position information. Specifically, the drive control unit 41 detects the rotation direction position of the rotor 10 as any one of the first rotation position to the sixth rotation direction position after adding the energization in the energization pattern. If possible, start synchronous operation. This makes it possible to detect the rotational direction position of the rotor 10 and to excite the phase winding 12 that is more suitable for the rotor 10 to rotate smoothly based on the detected rotational direction position. Therefore, the synchronous operation can be started in a shorter time.

  In the start-up operation example of FIG. 4, in the additional energization process, the drive control unit 41 sets the motor to the second energization number k in the energization pattern added after the predetermined energization reaches the upper limit value Sk. The unit 1 is restarted. By providing the upper limit value Sk for the second number of energizations k during the additional energization period, the motor unit 1 can be restarted when the starting operation is extremely unlikely to succeed.

  In addition, in the start-up operation example in FIG. 4, the upper limit value Sk of the second energization frequency k is 6, as described above. In other words, the upper limit value Sk of the second energization number k is, when the rotor 10 is assumed to rotate smoothly, from the rotation direction position at the end of the predetermined energization until the rotor 10 rotates 360 ° in electrical angle, assuming that the rotor 10 rotates smoothly. Is the number of times of energization. By doing so, the phase winding 12 of the motor unit 1 can be energized in all energization patterns until the second energization frequency k reaches the upper limit value Sk. Therefore, the activation success rate of the motor unit 1 is higher than in the case where power is supplied only in a part of the power supply pattern.

<2. Others>
As described above, the exemplary embodiments have been described in the present disclosure. Note that the scope of the present invention is not limited to the present disclosure. The present disclosure can be implemented with various modifications without departing from the spirit of the present invention. In addition, the items described in the present disclosure can be arbitrarily combined as appropriate without causing contradiction.

  INDUSTRIAL APPLICABILITY The present disclosure is useful for a motor drive control device that performs sensorless control of a motor unit, a motor, and a blower.

  Reference numeral 100: blower, 110: impeller, 111: blade, 120: motor, 200: DC power supply, 1: motor unit, 10: rotor, 11 ... Stator, 12 ... phase winding, 12u ... U phase winding, 12v ... V phase winding, 12w ... W phase winding, 12c ... neutral point, 13u ... U-phase terminal, 13v: V-phase terminal, 13w: W-phase terminal, 3: inverter, 3a: resistor, 31u, 31v, 31w: upper arm switch, 32u, 32v, 32w ..Lower arm switch, 4 ... motor drive controller, 41 ... drive controller, 42 ... current detector, 43 ... memory unit, 44 ... voltage detector, 46 ... Position information generation unit, 47: rotation speed detection unit, Vu: U-phase terminal voltage, Vv: V-phase terminal voltage, w: W-phase terminal voltage, Vn: virtual neutral point voltage, CA: central axis, n: order of energization pattern, m: first number of energization, k ... (2) Number of energization times, Sk: Upper limit of second energization number

Claims (8)

A drive control unit that controls the driving of the motor unit to which the three-phase AC voltage is input, and switches the energization pattern to the phase winding of the motor unit in a predetermined order;
A voltage detection unit that detects a voltage of the phase winding;
A position information generation unit that generates rotation direction position information in a rotation direction of a rotor of the motor unit based on a detection result of the voltage detection unit,
With
The drive control unit, according to the rotation direction position information after a predetermined energization,
When the rotational direction position of the rotor can be detected as any rotational direction position from the first rotational direction position to the sixth rotational direction position that is divided into electrical angles of 60 °, the energization pattern is determined. Start synchronous operation to switch according to the rotation direction position information,
A motor drive control device that adds energization in the energization pattern when the rotational direction position of the rotor cannot be detected as any of the rotational direction positions.   2. The motor drive control device according to claim 1, wherein the predetermined energization is performed by the first energization number in the energization pattern without using the rotation direction position information.   The motor drive control device according to claim 2, wherein the first number of energization times is a number of energization times until the rotor rotates 720 ° in electrical angle. The drive control unit includes:
After the energization in the energization pattern is added, if the rotational direction position of the rotor can be detected as any one of the first rotational direction position to the sixth rotational direction position, the synchronization is performed. The motor drive control device according to any one of claims 1 to 3, which starts operation. The drive control unit includes:
5. The motor according to claim 1, wherein the motor unit is restarted when the second number of times of energization in the energization pattern added after the predetermined energization reaches an upper limit value. Motor drive control device.   6. The motor drive control device according to claim 5, wherein the upper limit value of the second energization number is an energization number until the rotor rotates 360 ° in electrical angle from a rotation direction position at the end of the predetermined energization. 7. . A motor section to which a three-phase AC voltage is input,
The motor drive control device according to any one of claims 1 to 6, which controls driving of the motor unit.
A motor. An impeller having blades rotatable about a central axis extending in a vertical direction,
The motor according to claim 7, which rotates the blade,
A blower comprising:

Images